A loan secured by the Norden Park property in Norwalk, once a radar development facility for the Norden Systems division of Northrop Grumman, was sold at a $57.2 million loss according to Trepp.

At an original loan principle of $72.2 million, it amounted to a 75 percent loss. Trepp stated the offices were 70 percent vacant at the time of liquidation.

Northrop Grumman scaled back the size of its Norden Systems facility in Norwalk before announcing plans in 2012 to leave the facility when its lease expired in 2014, at a cost of about 300 jobs at the time.

Appraised at $97 million in 2005 at the time it was acquired by Fortis Property Group, the Norden Park property totals more than 600,000 square feet of space. Longtime tenant Tauck recently secured space in Wilton for a new headquarters.